Iphone is supposed to be launched by September 2020 but suspect that it might be delayed further because of covid19 situation.
One major update which this upcoming model will feature is Sensor shift stabilization for camera. It will further improve camera performance and you will be able to take more enhanced photos while moving. It might come up with 4 camera but it is not confirmed yet.
All these new hardware features will increase overall size of Iphone and it is said that this might be the tallest phone of Apple. I don't personally like their design but Apples users might find it lucrative.
In camera department, we could see further updates like optical lens which will dramatically improve photography experience. So far this model is more concerned on camera performance but we might see further updates in coming months.